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Stockholders' Equity - Summary of Warrants Outstanding (Details) - USD ($) | 12 Months Ended |
--- | --- | ---
Dec. 31, 2017 | Dec. 31, 2016
Summary of warrants outstanding |  |
Number of warrants (shares) | 284,091 | 284,091
Common Stock Warrant Liability | $ 360,795 | $ 1,167,614
March 2013 financing |  |
Summary of warrants outstanding |  |
Exercise price ($ per share) | $ 3.17 |
Expiration Date | Sep. 12, 2018 |
Number of warrants (shares) | 284,091 | 284,091
Common Stock Warrant Liability | $ 360,795 | $ 1,167,614

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